Muffler.



J. A. STEINMETZ.

MUPFLER.

APPLICATION FILED APR. 12, 1913. 1,087,468. Patented Feb. 17, 1914.

@Romana tube A and concentric therewith, the annubustion engines.

vthe ends of the larger tube by imperforate -cupzis provided with a set of perforations wall of either tube and all are held-firmly,

VThe entering gases pass laterally from the JOSEPH A. STEINME'IZ, OF PHILADELPHIA, PENNSYLVANIA.

MUFFLER.

Specication of Letters Patent.

Patented Feb. 17, 1914.

Application led April 12, 1913.` Serial No. 760,678.

To all 'whom 'it may` concern Be it known that I, JOSEPHA. STEINMETZ, a citizen of the United States,"` residing at Philadelphia in the county of Philadelphia and State of Pennsylvania, have invented cert-ain new and useful'Improvementsin Muiilers, of which the following is a speciiication, reference'being had therein ,to the accompanying drawing. v

lihe general object of my invention is to,l provide an unusually compact and eiiicient muffler especially adapted for internal com- In the accompanying drawing, A represents a strong cylindrical tube and B amuch larger tube inclosing a medial portion of the,

lar passage between the two being closed at walls C, C, through which the smaller tube projects. The inner tube has near these walls,'respectively, sets D, D of perforations,\ and between the sets it is closed by a diaphragm E.

The end wall C, shown in this instance as integral with the larger tube, is held between nuts F, F enla-threaded portion of the inner tube, and the wall C', which is part of a closely fitting'cap passed over the correspondin end ofthe tube B, is similarly held y nuts F2, Fi., the latter nut, however, being a. cup having lateral slots F. The annular space kbetween the tubes contains a series of opp'ositelj7 turned rounded cups G, G which have thelr bottoms so perforated that they t and slide upon the mner tube, while all taken together, abutting against each other, fillthe space between the walls C,C. Each I-I, preferablyat some distance from the and even put under spring tension when desired, by the suitably adjusted nuts holding the `end plates CC, C. The parts being assembled as'shown and gases under very high tension being admitted a't the right hand end of the inner tube, there will be a practically noiseless discharge of the gases atvthe opposite end of the structure, for the heat energy is'partly converted into work and partly radiated, and the velocity is very greatly reduced.

inner tube into the first cup, which allows expansion through its greater volume and in position which is pressed to the left, springing all the other cups slightly. Having here lost some heat by radiation, expansion and work, the gas passes through the series of small perforations into the annular chamber between the firsty and second cups, a chamber having very great radiating surface in comparison with its capacity. Thence it passes into the approximately spherical chamber between the next two cups, then intol another chamber or triangular cross section, like that betweenthe first and second cups, and then, if there be but the four cups shown for illustration, into a terminal cup, whence it passes again into the inner tube and is discharged through the slots F4.

As the main parts of the apparatus are of thin spring metal, it is light, radiates rapidly, and the cups spring under great stress, and instantlyret'urn to normal form when stress ceases.

It is import-ant that allv the parts may be readily separated for cleaning or repair, and

that the gas always travelsfin the same general direction and no part of the stream is jacketed by a returningstream. Y

It has been found that satisfactory results can be obtained without undue length of the apparatus, andthat loss inv radiation practically neutralizes the gain which might be sought by returning the gases and thus lengthening their path without correspondingly lengthening the device.

WhatI claim is l. In a muffler, the combination with a terminally closed tube, of a second smaller concentric tube passing axially through the iirst,l having, within and near the ends of the first sets of lateral perforations,\a partition fully obstructing the tube between said sets, and a series of oppositely turned, laterally perforated resilient rounded cups loosely mounted on the inner 'tube and fitting both tubes, one terminal cup being yin position to receive gases from the perforations of the first of said sets andthe other set.

`2. In a muli-ier, the combination with a tube closedat one end and having at the to discharge through the second` opposite endan adjustable cap closure, of n a smaller concentric4 tube passing axially 4through the first tube, and having within the same near its ends sets of lateral perforations, a stopcutting off 'the passage through the tube between said sets,4 a linear end closures carried inward and fixed to the smaller tube between its ends and said sets respectively, and a series of slidable oppositely turned cups pressed-toward each other longitudinally. of the tubes, fitting both tubes and provided, respectively, with sets of. perforations Abetween their lines of contact with the twoi tubes,

4. The combination with a tube' provided with an ilnperforate central diaphragm and with sets of lateral perforations near 'its open ends, of a series .of oppositely turned rounded, laterally perforated c ups each itting and sliding upon .said tube, the interiors of the terminal cupsbeing in communication with said sets, respectively, a second concentric tube fitting the margins of the cups and-terminally closediagainst the exterior of the inner tube..

5. A muffler receiving gases at one end and discharging them at the opposite end and comprising a tube closed at one end and with a series of oppositely turned, approxi mately hemispherical 'resilient diaphragms, each having in its curved surface ya set of erforation's, a smaller concentric ltubepassing axially through the first tube and the cups,.and a loose cap closing the remaining end'of the outer tube, and an adjustable nut working on the projecting open end portion of the smaller tube for pressing. sai cap against the series of cups.

6. The combination with concentric tubes provided with a slidable ,perforated diaphragm in the intervening ,annular space etween them, of means for dlsch'argmg into one end of said space hot gases under high tension, and discharging the same gases from the opposite end, and a yielding element resisting the sliding of said diaphragm under the pressure or' gas upon it.

7. The combination with concentric tubes having the annular intervening space terminally closed, of a series of two cup-like oppositely turned perforated diaphravms slidably fitting said space, means for de iv` ering hot gases into one end and discharging them from the other end of said s ace, and a spring opposing themsliding o one diaphragm under pressure of as upon it. 8. The combination of a mu er casing of thin metal provided with inlet and discharge passages, of internal diaphragms adapted to divide the interior into communicating chambers and to resist strongly yet yieldingly movements urged by momentary increases of gas pressure; whereby the muflier radiates a portion of the heat of the entering gas and simultaneously converts another portion into Work, insuring a .rapid decrease im temperature and tension.

In testimony whereof I affix my signature in presence of two witnesses.

` JOSEPH A. STEINMETZ.

Witnesses:

ROBERT JAcoBsoN, H. G. VAN COURT. 

